UK Tax Deadlines 2025/26
Every deadline UK limited company directors need to know. Corporation Tax, VAT, Self Assessment, Companies House — all in one place.
Penalties add up fast. Late Companies House accounts start at £150 and reach £1,500. Late Self Assessment is £100 immediately, then £10/day after 3 months. Don't risk it.
Tax Returns & Payments
Self Assessment Tax Return Deadline 2024/25
Past31 Jan 2026
Self Assessment Tax Return Deadline 2025/26
316 days31 Jan 2027
Corporation Tax Return (CT600) Deadline
Variable12 months after accounting period end
Corporation Tax Payment Deadline
Variable9 months and 1 day after accounting period end
First Payment on Account
Past31 Jan 2026
Second Payment on Account
132 days31 Jul 2026
Companies House
ACSP Registration Deadline
Past18 Mar 2025
Companies House Identity Verification Rollout
Past1 Apr 2025
Companies House Fee Changes
Past1 Feb 2026
Company Internal Registers No Longer Required
Past18 Nov 2025
Confirmation Statement Deadline
Variable14 days after anniversary of incorporation or last confirmation statement
Annual Accounts Filing Deadline
Variable9 months after accounting reference date (first accounts: 21 months)
Coming Changes
Penalty Quick Reference
Self Assessment
1 day late£100
3 months late+£10/day (max £900)
6 months late+5% of tax or £300
12 months late+5% of tax or £300
Corporation Tax Return
1 day late£100
3 months late+£100
6 months late+10% of unpaid tax
12 months late+10% of unpaid tax
Companies House Accounts
Up to 1 month late£150
1-3 months late£375
3-6 months late£750
Over 6 months£1,500
VAT (Points System)
Each late return = 1 penalty point
Quarterly filers4 points = £200/late return
Monthly filers5 points = £200/late return
Annual filers2 points = £200/late return
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